Movie 1

Simulation of clock and scaled gradient model
In the clock and scaled gradient model, each cell has a clock and a morphogen that shows a gradient in posterior to anterior direction. For simplicity, we assumed the clock oscillates synchronously along the PSM (blue in upper column) but phase gradients do not affect the results of the model. The morphogen gradient always scales with PSM size by an unspecified mechanism (red in lower column). The mature somites are indicated by black lines, whereas 4 somites that are not visible but already determined are indicated by gray lines.